<!DOCTYPE html>
<meta charset="utf-8">
<!-- Generate token with the command:
generate_token.py http://127.0.0.1:8000 BeforeMatchEvent --expire-timestamp=2000000000 --version 3
-->

<meta http-equiv="origin-trial" content="A6qG2zhYsapjwU1J8SBwg56JXGIaUKzBXWy2hJ8V1U2fX/ZRPCwdajgTdBT/BFdDTmst9Dl2uFqsxc/3LPqmFgQAAABYeyJvcmlnaW4iOiAiaHR0cDovLzEyNy4wLjAuMTo4MDAwIiwgImZlYXR1cmUiOiAiQmVmb3JlTWF0Y2hFdmVudCIsICJleHBpcnkiOiAyMDAwMDAwMDAwfQ==">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<body>
<script>
test(t => {
  assert_equals(document.body.onbeforematch, null,
    'onbeforematch should be null instead of undefined when the feature is enabled.');

  assert_true(CSS.supports('content-visibility: hidden-matchable'),
    'CSS.supports() should show that hidden-matchable rule is enabled when the feature is enabled.');

}, 'Tests feature detection for the BeforeMatchEvent origin trial');
</script>
